package com.huzz.component;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * @Name SwaggerHandler
 * @Description 描述
 * @Author 童年的纸飞机
 * @Since 2023-08-2023/8/2 08:50
 */
@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider {
 
    public static final String API_URI = "/v2/api-docs";
 
    private final RouteLocator routeLocator;
 
    private final GatewayProperties gatewayProperties;
 
    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        Set<String> routes = new HashSet<>();

        // 取出gateway的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getUri().toString().replace("lb://", "")));

        routes.forEach(instance -> {
            resources.add(swaggerResource(instance, "/"+ instance + API_URI, "1.1"));
        });

        // 结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
        // 打开下面注释可以自动扫描接入gateway的服务，为了演示，只扫描system
//        gatewayProperties.getRoutes().stream().filter(routeDefinition ->  routes.contains(routeDefinition.getId()))
//                .forEach(routeDefinition ->
//                         routeDefinition.getPredicates().stream()
//                        .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
//                        .forEach(predicateDefinition -> resources
//                                .add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
//                                        .get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI)))));

        return resources;
    }
 
    private SwaggerResource swaggerResource(String name, String location, String version) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion(version);
        return swaggerResource;
    }
 
 
 
 
}
